Hello! I have 8-9 week old chicks. They are in the chicken coop. Inside if the coop I have a large dog kennel that is wrapped in plastic with a heat lamp In it for them to go in and out of if they get cold. The temperatures have been getting down to the 30s and 40s at night. We built them a roost yesterday. My neighbor is trying to convince me to take the dog kennel out and let them be on their own now. Are they too young to be without a heat lamp and the kennel? It seems as if they are all fully feathered. I just have a barnyard mix of sex links and barred rocks.